UML

用户类 用于网站的客户账号 是网站类的外部状态

/*** @ClassName: User* @Author: Leo* @Description: 用户类 用于网站的客户账号 是网站类的外部状态* @Date: 2019/5/28 9:58*/
public class User {private String name;public User(String name) {this.name = name;}public String getName() {return name;}public void setName(String name) {this.name = name;}
}

网站抽象类

/*** @ClassName: WebSite* @Author: Leo* @Description: 网站抽象类* @Date: 2019/5/28 10:00*/
public abstract class WebSite {/*** 模拟用户使用网站** @param user*/public abstract void use(User user);
}

具体的网站

/*** @ClassName: ConcreteWebSite* @Author: Leo* @Description: 具体的网站* @Date: 2019/5/28 10:05*/
public class ConcreteWebSite extends WebSite {private String websiteName;public ConcreteWebSite(String websiteName) {this.websiteName = websiteName;}@Overridepublic void use(User user) {System.out.println("网站名->" + websiteName + "   用户名->" + user.getName());}
}

网站工厂

import java.util.Hashtable;/*** @ClassName: WebSiteFactory* @Author: Leo* @Description: 网站工厂* @Date: 2019/5/28 10:10*/
public class WebSiteFactory {private Hashtable<String, WebSite> hashtable = new Hashtable<>();public WebSite getWebSite(String key) {if (hashtable.containsKey(key)) {return hashtable.get(key);} else {WebSite concreteWebSite = new ConcreteWebSite(key);hashtable.put(key, concreteWebSite);return concreteWebSite;}}public int getCount() {return hashtable.size();}
}

测试类

/*** @ClassName: Main* @Author: Leo* @Description: 测试类* @Date: 2019/5/28 9:58*/
public class Main {public static void main(String[] args) {WebSiteFactory factory = new WebSiteFactory();//以下三个是同一个享元对象WebSite f1 = factory.getWebSite("产品展示");f1.use(new User("小菜"));WebSite f2 = factory.getWebSite("产品展示");f2.use(new User("大鸟"));WebSite f3 = factory.getWebSite("产品展示");f3.use(new User("笨蛋"));WebSite f31 = factory.getWebSite("博客");f31.use(new User("钢蛋"));WebSite f32 = factory.getWebSite("博客");f32.use(new User("鸡蛋"));WebSite f33 = factory.getWebSite("博客");f33.use(new User("大神"));System.out.println("网站总数--->" + factory.getCount());}
}

运行结果